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Logical volume management(LVM) provides a higher-level view of the disk storage on a computer system than the traditional view of disks and partitions. This gives the system administrator much more flexibility in allocating storage to applications and users.

Storage volumes created under the control of the logical volume manager can be resized and moved around almost at will, although this may need some upgrading of file system tools.

VMware uses a file package called a VIB (VMware Installation Bundle) as the mechanism for installing or upgrading software packages on an ESX server.The file may be installed directly on an ESX server from the command line, or through the VMware Update Manager (VUM).

On a Linux system, trying to start up an 11g instance could fail with the following error :

ORA-00845: MEMORY_TARGET not supported on this system

Iin terms of 11g, MEMORY_TARGET is used instead of SGA_TARGET and MEMORY_MAX_TARGET is used instead of SGA_MAX_SIZE (defaults to MEMORY_TARGET ).Also please confirm that ORACLE_HOME is set correctly, this error sometimes happens when it's not set correctly.

It uses /dev/shm on Linux. If max_target set over /dev/shm size, you get the error messages ORA-00845 as well.

MEMORY_TARGET specifies the Oracle system-wide usable memory. The database tunes memory to the MEMORY_TARGET value, reducing or enlarging the SGA and PGA as needed.

2. MEMORY_MAX_TARGET

MEMORY_MAX_TARGET specifies the maximum value to which a DBA can set the MEMORY_TARGET initialization parameter. See the description of MEMORY_TARGET for more information about how the settings of MEMORY_MAX_TARGET and MEMORY_TARGET affect each other.

Internet SCSI (iSCSI) is a network protocol s that allows you to use of the SCSI protocol over TCP/IP networks. It is an alternative to Fibre Channel-based SANs, easily manage, mount and format iSCSI Volume under Linux. It allows getting access to a SAN storage over the Ethernet network.

Red Hat Enterprise Linux allows administrators to bind NICs together into a single channel using the bonding kernel module and a special network interface, called a channel bonding interface. Channel bonding enables two or more network interfaces to act as one, simultaneously increasing the bandwidth and providing redundancy. "bonding" should be configured in kernel level.

The DBMS_LOCK package provides an interface to Oracle Lock Management services. You can request a lock of a specific mode, give it a unique name recognizable in another procedure in the same or another instance, change the lock mode, and release it.

When you writing code in PL/SQL , you some times need to have logics for the application to sleep before the next processing. In PL/SQL you can use the below syntax for this Syntaxdbms_lock.sleep(no_of_seconds) :

If you want to create a virtual machine in VMWare ESXi5 or else. You need to modify the Server BIOS before that.

This virtual machine is configured for 64-bit guest operating systems. However, 64-bit operation is not possible sometimes.That is "VT-capable". VT might be disabled if it has been disabled in the BIOS settings or the host has not been power-cycled since changing this setting.